- A
needle telegraph is an
electrical telegraph that uses
indicating needles moved electromagnetically as its
means of
displaying messages. It is one of...
- a form of
needle telegraph, and the
first telegraph system to be put into
commercial service. The
receiver consisted of a
number of
needles that could...
-
consists of
needle telegraphs in
which a
needle pointer is made to move
electromagnetically with an
electric current sent down the
telegraph line. Early...
-
American Morse. In France, the
telegraph used the Foy-Breguet
telegraph, a two-
needle telegraph that displa**** the
needles in
Chappe code, the same code...
- and
Wheatstone telegraph, in a
series of improvements, also
ended up with a one-wire system, but
still using their own code and
needle displays. The electric...
- The
Schilling telegraph is a
needle telegraph invented by
Pavel Schilling in the
nineteenth century. It
consists of a bank of
needle instruments (six as...
-
electrochemical telegraph.
Schilling developed the
first electromagnetic telegraph that was of
practical use. Schilling's
design was a
needle telegraph using magnetised...
- inventions,
including the five-
needle telegraph of Wheatstone, and an
alarm worked by a relay, in
which the current, by
dipping a
needle into mercury, completed...
- Some
early telegraph systems, such as Schilling's 1832
experimental needle telegraph and the 1837
Cooke &
Wheatstone five-
needle telegraph used by British...
-
electromagnet in the
receiving instrument. Many of the
earliest telegraph systems used a single-
needle system which gave a very
simple and
robust instrument. However...